X0508 4 2026-02-03 0001557746 Aclaris Therapeutics, Inc. ACRS 0001604457 Walker Neal C/O ACLARIS THERAPEUTICS, INC. 701 LEE ROAD, SUITE 103 WAYNE PA 19087 true true false false CEO 0 Common Stock 2026-02-03 4 M 0 63475 A 1562497 D Common Stock 2026-02-03 4 F 0 18611 3.47 D 1543886 D Restricted Stock Units 2026-02-03 4 M 0 63475 0 D Common Stock 63475 190425 D Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer. The transaction reported represents the withholding of shares by the issuer to satisfy the Reporting Person's tax withholding obligations in connection with the vesting and settlement of restricted stock units described in this Form 4. The shares underlying these restricted stock units vest in four equal installments on the first, second, third and fourth anniversaries of February 3, 2025, subject to the Continuous Service (as defined in the Plan) of the Reporting Person as of each such date. /s/ Matthew Rothman, Attorney-in-Fact 2026-02-05